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    <head>
        <meta charset="UTF-8">
        <title>数据代理</title>
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        <script type="text/javascript" src="../js/vue.js"></script>
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        <div>
            <p>数据代理：通过一个对象代理对另一个对象中属性的操作（读/写）</p>
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        <script type="text/javascript">
            let obj = {x: 100}
            let obj2 = {y:200}

            Object.defineProperty(obj2, 'x', {
                get(){
                    return obj.x
                },

                set(value){
                    obj.x = value
                }
            })
        </script>
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</html>
